Preparation and characterization of lithium thiogermanate thin films using RF magnetron sputtering
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Commercially developed in 1991, lithium ion batteries have long attracted the attention of scientists because of the high electropositivity of lithium. As power requirements become more demanding, batteries are also expected to provide the high energy densities necessary to keep pace. Chalcogenide glasses have long held an interest in battery applications because of the polarizability of the sulfide anion which is believed to be the cause of its superior conductivities. This class of materials exhibits room temperature conductivities on the order of 10-2 S/cm. Targets in the Li2S-GeS2 binary system have been sputtered in Argon and Nitrogen atmospheres using an RF magnetron sputtering technique with the hope of creating a new class of electrolytes with increased conductivity and stability in contact with litium. Films were characterized using IR, Raman and X-ray photoelectron spectroscopies in order to evaluate their structure. Our progress in producing and characterizaing these ion conducting sulfide thin films will be reported.